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Homework Help: Find acidic aquenous solutions

  1. Apr 5, 2014 #1
    1. The problem statement, all variables and given/known data

    Which of the following chemical compounds are acidic aqueous solutions?

    C2H2, C3H8, CH3OH, HCOOH, CH3OCH and benzene.

    2. Relevant equations

    Not known.

    3. The attempt at a solution

    The hydrocarbons aren't polar, that much I know. In the list there are, however, two polar compounds...

    I know the answer is that only HCOOH is an acidic aqueous solution, but no explanation is given. Am I supposed to be able to tell which ones are acidic aquenous solutions simply by looking at the chemical formula? Should I write the reaction first ([compound] + H2O → ...) and if so, how would I know what the products are in each case? After all, wouldn't I need the products in order to determine how much H3O- and HO-ions are produced?
  2. jcsd
  3. Apr 5, 2014 #2
    Actually, I also have a second question: which of the above mentioned compunds form hydrogen bonds between molecules? The book gives me the answer but not explanation.

    Again, how am I supposed to know this simply by looking at the formulas?
  4. Apr 5, 2014 #3


    User Avatar

    Staff: Mentor

    It is about functional organic groups and recognizing alcohol, aldehyde and carboxylic acids.
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